After it is established which of the cables are broken, we have to replace them - Unsolder the old cable and remove it

I decided to NOT cover the new cable in crymp-flex, to they can move more freely

Slide the new cable through the cable-guides near the hinge and drag it all the way through to the PCI-e connection to allow enough slack on the cable to solder it on

Pre-solder the new cable and prepare the antenna solder area (remove the older soldering and add a small new lump of soldering). Note the exact location of the old antenna.

Solder on the new cable to the antenna, shield first, then center core. it is not irrelevant where it goes. Pay attention not to heat the cable sheild too much so it melts the insulator to the core wire. Use the location of the old antenna cable

Retract the new cable through the cable guide

Guide the Wi-Fi antenna cables around the hinge and into the PC it self

I opted to route the cables the other side round the hinge than Lenovo originally did See the image